WO2019109715A1

WO2019109715A1 - Microphone module

Info

Publication number: WO2019109715A1
Application number: PCT/CN2018/107865
Authority: WO
Inventors: 欧铭绪
Original assignee: 歌尔股份有限公司
Priority date: 2017-12-08
Filing date: 2018-09-27
Publication date: 2019-06-13
Also published as: US20200275179A1; US11178476B2; CN207665147U

Abstract

Disclosed in the present invention is a microphone module. The module comprises: a housing having sound receiving holes; a pressure plate fixedly combined with the housing, an accommodating cavity being formed between the inner surface of the pressure plate and the outer surface of the housing, and the pressure plate comprising sound transmission holes corresponding to the sound receiving holes; and an intermediate layer covering the sound receiving holes, provided on the outer or inner surface of the housing, and corresponding to the sound receiving holes. The housing further comprises an annular protrusion having a channel, extending outwards from the outer surface of the housing, and surrounding the sound receiving holes. According to the microphone module provided in the present invention, by combining sound transmission holes with an annular protrusion provided with a channel, the vibration amplitude of an intermediate layer remains small even when the microphone module is subjected to high-pressure water flow impact, such that deformation and breaking of the intermediate layer is avoided. Therefore, the influence on the acoustic property and water resistance of the microphone module is reduced.

Description

Microphone module

Technical field

The invention relates to the field of electronic product technology. More specifically, it relates to a microphone module.

Background technique

The existing microphone module usually needs to have a certain waterproof capability. The current waterproof microphone module generally has a waterproof intermediate layer at the sound receiving hole or a complicated water outlet to avoid the water entering the sound hole, but the above method is costly. And when the water flow pressure is large, the intermediate layer such as the waterproof membrane is subjected to a large pressure vibration amplitude, resulting in deformation or cracking, affecting the acoustic performance and waterproof performance of the microphone module.

Therefore, it is necessary to provide a microphone module to solve the above problems.

Summary of the invention

An object of the present invention is to provide a microphone module to solve the problem that the existing waterproof microphone module has a large vibration amplitude when the water flow pressure is large, causing deformation or cracking of the intermediate layer, thereby causing acoustic performance of the microphone module. The problem of reduced waterproof performance.

In order to achieve the above object, the present invention adopts the following technical solutions:

a microphone module, the module comprising: a housing having a sound receiving hole; and a pressing plate fixedly coupled with the housing; a cavity formed between an inner side surface of the pressing plate and an outer side surface of the housing And the platen includes a sound-permeable hole corresponding to the sound-receiving hole; and corresponding to the sound-receiving hole, an outer layer covering the sound-receiving hole is disposed on an outer side surface or an inner side surface of the shell; The housing further includes an annular protrusion extending outwardly from an outer side surface of the housing surrounding the sound receiving hole, an end surface of the annular protrusion facing away from the housing and an inner side of the pressure plate The surface is fixedly fixed; the annular protrusion partitions the cavity into a first cavity formed inside the annular protrusion, and a second cavity formed outside the annular protrusion; the first cavity The body and the second cavity communicate with each other through a passage on the side wall of the annular boss; the pressure plate further includes a drain hole penetrating the inner and outer surfaces of the pressure plate, the drain hole and the second cavity Connected.

Preferably, the passage is formed by a through hole penetrating through the inner and outer side wall faces of the side wall of the annular boss portion on the side wall of the annular boss portion.

Preferably, the passage is formed by a notch formed on the end face of the annular projection facing away from the housing, the notch extending through the inner and outer side wall faces of the annular projection side wall.

Preferably, the bottom of the gap extends to an outer side surface of the housing.

Preferably, the intermediate layer is a waterproof sound-permeable membrane or a water-absorbing medium layer.

Preferably, the pressure plate includes a plurality of sound-permeable holes, and the plurality of sound-permeable holes are correspondingly disposed in a region defined by the annular convex portion.

Preferably, the drain hole is located in the axial direction of the passage.

Preferably, the side wall of the annular convex portion has a contracted structure, and an inner side surface of the side wall of the annular convex portion is disposed on a slope.

Preferably, the drain hole is located at a bottom edge of the pressure plate, and a surface of the inner side wall of the housing cavity corresponding to the drain hole is disposed on a slope.

Preferably, the water permeable hole has a diameter of 0.1 to 0.15 mm.

The beneficial effects of the present invention are as follows:

The microphone module provided by the invention is combined with the sound-transmitting hole and the annular convex portion provided with the passage, so that when the microphone module is subjected to the high-pressure water flow, the pressure of the water flow is relieved by the sound-permeable hole. The vibration amplitude of the middle layer is small, which avoids the impact and damage of the water flow on the intermediate layer, and ensures the acoustic performance and waterproof performance of the module; meanwhile, the water flow blocked by the intermediate layer can flow out of the module through the channel, and the above simple module The design makes the microphone module have good waterproof ability and can adapt to the use scene such as washing.

DRAWINGS

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a microphone module according to an embodiment of the present invention.

2 shows a cross-sectional view of a microphone module in accordance with an embodiment of the present invention.

Fig. 3 shows an enlarged view of a portion A in Fig. 3.

LIST OF REFERENCE NUMERALS 1 - housing, 11 - annular projection, 12 - sound hole, 13 - channel, 2-plate, 21 - sound hole, 22 - drain hole, 3 - intermediate layer.

Detailed ways

In order to explain the present invention more clearly, the present invention will be further described in conjunction with the preferred embodiments and the accompanying drawings. Similar components in the drawings are denoted by the same reference numerals. It should be understood by those skilled in the art that the following detailed description is intended to be illustrative and not restrictive.

At present, the application of electronic devices is more and more extensive, and people have higher and higher requirements for waterproofing of electronic devices. Therefore, a microphone module, which is one of the commonly used electronic devices, usually needs to have a certain waterproof capability.

However, the current waterproof microphone module generally adopts a water absorbing layer or a relatively complicated water outlet to avoid water in the sound receiving hole. The manufacturing cost of the microphone module is high, and when the water flow pressure is large, the middle layer For example, a waterproof membrane or the like is subjected to a high impact force of a high-pressure water flow, so that the vibration amplitude of the intermediate layer is large, which easily causes deformation or cracking thereof, and affects the acoustic performance and waterproof performance of the microphone module. In order to solve at least one of the above problems, the present invention provides a microphone module.

Specifically, the present invention provides an embodiment. Referring to FIG. 1 and FIG. 2, a microphone module includes: a housing 1 having a sound receiving hole 12; and a pressing plate fixedly coupled with the housing 1. 2; a cavity is formed between an inner side surface of the pressure plate 2 and an outer side surface of the casing 1, and the pressure plate 2 includes a sound transmission hole 21 corresponding to the sound receiving hole 12, of course, for dispersion Water pressure, and reducing the influence on sound transmission, the sound-transmitting hole 21 should be plural, a plurality of sound-permeable holes 21 correspondingly disposed in a region defined by the annular convex portion 11; and the sound-receiving hole Correspondingly, an outer layer or an inner side surface of the casing 1 is provided with an intermediate layer 3 covering the sound receiving hole 12; the casing 1 further includes an outer casing 12 surrounding the sound receiving hole 12 An annular convex portion 11 extending outwardly from the outer side surface, an end surface of the annular convex portion 11 facing away from the housing 1 is fixedly fixed to an inner side surface of the pressure plate 2; the annular convex portion 11 is The cavity is divided into a first cavity formed inside the annular boss 11 and formed in the ring a second cavity outside the boss portion 11; the first cavity and the second cavity are communicated by a passage 13 on the side wall of the annular boss portion 11; the pressure plate 2 further includes a penetrating platen 2 a drain hole 22 on the outer side surface, the drain hole 22 being in communication with the second cavity.

The microphone module provided by the invention is combined with the sound-transmitting hole and the annular convex portion provided with the passage, so that when the microphone module is subjected to the high-pressure water flow, the pressure of the water flow is relieved by the sound-permeable hole. The vibration amplitude of the middle layer is small, which reduces the impact and damage of the water flow on the intermediate layer, and ensures the acoustic and waterproof performance of the module; meanwhile, the water flow blocked by the intermediate layer can flow out of the module by the channel, and the above simple module design The microphone module has good waterproof capability and can be adapted to use scenes such as washing.

In order to make the sound-permeable hole 21 have a blocking effect on the high-pressure water flow, the diameter of the sound-permeable hole 21 should not be too large, but the sound-permeable hole 21 is too small to easily affect the sound transmission, thereby affecting the acoustic performance of the microphone module. Obviously, the diameter of the sound-permeable hole 21 has a preferred interval, and the embodiment is preferably 0.1-0.15 mm.

Optionally, the channel 13 has a plurality of forming manners. As shown in FIG. 3, the channel 13 is formed by a notch formed on the end surface of the annular protrusion 11 facing away from the housing 1. The inner and outer side wall faces of the side wall of the annular boss portion 11 are described. As a preferred embodiment of this embodiment, in order to increase the amount of hydrophobicity of the passage 13, the bottom of the notch extends to the outer side surface of the casing 1.

Of course, the above-mentioned channel 13 has other forming manners. For example, the channel 13 is formed by a through hole extending through the inner and outer side wall surfaces of the side wall of the annular convex portion 11 on the side wall of the annular convex portion 11. The functional function is the same as that of the previous embodiment, and thus the present invention will not be described again.

In addition, the intermediate layer may be a waterproof membrane or a water absorbing medium layer, the material of the waterproof sound permeable membrane may be a hydrophobic material, the material of the water absorbing medium layer shall be a material having high water absorbing property, or the intermediate layer may be a structure having a drainage channel. The layers, it will be apparent to those skilled in the art that although the present invention does not exhaustively the structure or material of all possible intermediate layers, it should be understood that the intermediate layer of the present invention is not deviated from the subject matter of the present invention. Other structures having the same functional function are still within the scope of the present invention.

Further, in order to make the water flow more exhaustive under the action of gravity, the drain hole 22 is located in the axial direction of the passage 13, as is known in the art, when the microphone module is placed as shown in Fig. 2, the water flow Discharge is faster and more thorough.

As shown in FIG. 3, in order to prevent water droplets from remaining in the microphone module, the present invention provides a preferred embodiment. The side wall of the annular protrusion 11 has a contracted structure, and the inner side surface of the side wall of the annular protrusion 11 is a beveled surface, this embodiment utilizes the influence of gravity, and the side wall of the convex portion is designed as a wedge structure as shown in FIG. 3, so that the water flow slides down the first cavity on the inner side surface of the side wall, thereby The water droplets are less likely to be left in the annular convex portion 11, and the water droplets are prevented from entering the sound receiving hole 12 by external force such as shaking when the microphone is used, thereby adversely affecting the acoustic performance of the microphone module.

The same as the principle of the last preferred embodiment, as shown in FIG. 3, the inner side wall surface of the housing 1 corresponding to the drain hole 22 is disposed on a sloped surface. Of course, the drain hole 22 is located on the pressure plate 2 The bottom edge is such that water droplets do not easily remain in the second cavity. It should be noted that the drain hole 22 of the present invention is located at the bottom edge of the pressure plate 2, which should be understood as the bottom of the drain hole 22 as shown in FIG. The edge is located outside or at the bottom edge of the inner side wall of the corresponding housing 1 cavity, and the present invention will not be described again.

In addition, the present invention is not limited to the combination of the pressure plate 2 and the housing 1, but as shown in FIG. 3, as a preferred solution, in order to make the housing 1 and the pressure plate 2 more firmly bonded, the housing 1 is combined with the pressure plate 2. The inner side wall may be formed as a stepped structure, the side wall of the pressure plate 2 is fixedly fixed with the inner side wall of the step structure, the bottom wall edge of the pressure plate 2 is fixedly fixed with the inner bottom surface of the step structure, and the invention is not limited to the combination thereof. The manner is bonding or abutting, but it should be noted that the above-described improvements without departing from the subject matter of the present invention are still within the scope of the invention.

It is apparent that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention, and those skilled in the art can also make the above description. It is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

A microphone module, the module comprising:

a housing having a sound hole;

a fixed pressure plate is coupled to the housing; a cavity is formed between an inner side surface of the pressure plate and an outer side surface of the housing, and the pressure plate includes a sound transmission hole corresponding to the sound receiving hole; Corresponding to the sound receiving hole, an outer layer covering the sound receiving hole is disposed on an outer side surface or an inner side surface of the casing;

The housing further includes an annular protrusion extending outwardly from an outer side surface of the housing surrounding the sound receiving hole, an end surface of the annular protrusion facing away from the housing and an inner side of the pressure plate Surface fit and fixed;

The annular protrusion partitions the cavity into a first cavity formed inside the annular protrusion, and a second cavity formed outside the annular protrusion;

The first cavity and the second cavity communicate with each other through a passage on the side wall of the annular protrusion;

The pressure plate further includes a water leakage hole penetrating through the inner and outer surfaces of the pressure plate, and the water leakage hole is in communication with the second cavity.
The module according to claim 1, wherein said passage is formed by a through hole extending through a side wall surface of said annular boss portion on a side wall of said annular boss portion.
The module according to claim 1, wherein said passage is formed by a notch formed on an end surface of said annular projection facing away from said housing, said notch penetrating through the inner side of said side wall of said annular projection Wall.
The module of claim 3 wherein the bottom of the gap extends to an outer side surface of the housing.
The module according to claim 1, wherein said intermediate layer is a waterproof sound-permeable membrane or a water-absorbing medium layer.
The module according to claim 1, wherein the pressure plate comprises a plurality of sound transmission holes, and the plurality of sound transmission holes are correspondingly disposed in a region defined by the annular protrusion.
The module according to claim 1, wherein said drain hole is located in an axial direction of said passage.
The module according to claim 1, wherein the side wall of the annular convex portion has a contracted structure, and an inner side surface of the side wall of the annular convex portion is disposed on a slope.
The module of claim 1 , wherein the drain hole is located at a bottom edge of the pressure plate, and a surface of the inner wall of the housing cavity corresponding to the drain hole is disposed on a slope.
The module according to claim 1, wherein said water permeable aperture has a diameter of from 0.1 to 0.15 mm.